package com.yeebo.conf;

import com.yeebo.enums.ResultCode;
import com.yeebo.vo.Result;
import org.apache.shiro.web.filter.authc.UserFilter;
import org.springframework.http.HttpStatus;
import org.springframework.web.bind.annotation.RequestMethod;

import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.io.PrintWriter;

public class ShiroUserFilter extends UserFilter {

    /**
     * 在访问过来的时候检测是否为OPTIONS请求，如果是就直接返回true
     */
    @Override
    protected boolean preHandle(ServletRequest request, ServletResponse response) throws Exception {
        HttpServletRequest httpRequest = (HttpServletRequest) request;
        if (httpRequest.getMethod().equals(RequestMethod.OPTIONS.name())) {
            return true;
        }
        return super.preHandle(request,response);
    }

    /**
     * 该方法会在验证失败后调用，这里由于是前后端分离，后台不控制页面跳转
     * 因此重写改成传输JSON数据
     */
    @Override
    protected void saveRequestAndRedirectToLogin(ServletRequest request, ServletResponse response) throws IOException {
        saveRequest(request);
        PrintWriter out = response.getWriter();
        //自己控制返回的json数据
        out.println(new Result(ResultCode.NEED_LOGIN.getCode(), ResultCode.NEED_LOGIN.getMessage(), ""));
        out.flush();
        out.close();
    }

}
